2. Motor and Drive
Greatork three-phase squirrel-cage asynchronous motor designed by advanced special software can work in extreme environments with F class insulation. The motor shaft and worm shaft are separate in order to facilitate rapid replacement. Worm and worm shaft are immerged in lubricant to fit temperature change.

3. Terminal Compartment
Separately sealed terminal compartment can make sure of the integrity of the electrical control part even when the terminal compartment cover is removed for site wiring.

5. Valve Position Counter
Greatork discards traditional potentiometer to measure valve position and introduce hall incremental encoder to improve the position accuracy.

6. Local Control
Local control switch (Local/stop/Remote) and pushbuttons are magnetic switches without penetrating shafts and control the actuator by internal magnetic reed. It can meet the requirements of tight seal and damp-proof.

7. Infrared Setting
Infrared setting tool can set and diagnose actuator through sealed indication window without removing the electric cover. The communication distance between setting tool and window is within 0.75 meters.

AVAR Range Electric Actuator

The Internal Structure of AVAR Actuator

1. Liquid crystal display
Dot Matrix LCD with blue backlight can clearly show Chinese or English menu. Real-time valve position, torque valve, actuator current status and fault information will also be shown. At the bottom of the screen, there are three high brightness diodes which can indicate open, close and middle position of valve.

2. Main board
The adoption of SOC chip and high integrated circuit design provide actuator with multiple functions such as fault detection, self-protection and alarm. Therefore, the reliability of actuator is improved.

3. Valve position control
Hall absolute encoder driven by main shaft can measure the valve position accurately.

4. Button
There is four buttons called local/remote/menu button, open/plus button, and close/minus bottom and stop/enter button on the actuator. User can set up various functions of actuator easily with these buttons.